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Unformatted text preview: POLYMER PROCESSING - FALL 2002 NAME:PUT ON LAST PAGE and SIGN HONOR CODE EMA 4666C - EXAM I STUDENT #:______________________ INSTRUCTIONS: Read the entire exam carefully . Answer every question to the best of your ability, based upon the available information. State all assumptions in answers. (26 questions, 1 bonus question, 110 pt. Total) SECTION I: Polymer Structures/Properties. 1. Draw the structural repeat units for the following polymers. 2. Indicate the type of polymerization process used to synthesize each of the structures, i.e. condensation, addition, ring opening. 3. State the relative Tg and/or Tm for each polymer. If a Tm is not expected indicate by NA. (24pts) Polymer Structural Repeat Unit Process Tg Tm 1. poly(ethylene) 2. poly(propylene) 3. poly(caprolactam) (Nylon 6) 4. poly(dimethylsiloxane) 5. poly(ethylene terephthalate) 6. poly(bisphenol A carbonate) Student Number:___________________________ Concepts. Answer the following statements with TRUE or FALSE . If the statement is false, state the reason(s). If you believe a statement can be made TRUE by a simple qualifier, then state it clearly. (12 pts) 7 . Pressure flow for a simple channel in the screw of the extruder is independent of screw speed. 8 . Pressure drop from the screw to the exit of the die is directly related to the melt viscosity. 9 . A spider die provides a uniform distribution of melt over a wire for film extrusion....
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- Spring '08